diff --git a/monitor/bt.h b/monitor/bt.h
index 1b70f43..f4f3f2d 100644
--- a/monitor/bt.h
+++ b/monitor/bt.h
@@ -1634,6 +1634,13 @@ struct bt_l2cap_att_read_type_rsp {
 	uint8_t  length;
 } __attribute__ ((packed));
 
+#define BT_L2CAP_ATT_READ_REQ			0x0a
+struct bt_l2cap_att_read_req {
+	uint16_t handle;
+} __attribute__ ((packed));
+
+#define BT_L2CAP_ATT_READ_RSP			0x0b
+
 #define BT_L2CAP_ATT_READ_GROUP_TYPE_REQ	0x10
 struct bt_l2cap_att_read_group_type_req {
 	uint16_t start_handle;
@@ -1645,6 +1652,18 @@ struct bt_l2cap_att_read_group_type_rsp {
 	uint8_t  length;
 } __attribute__ ((packed));
 
+#define BT_L2CAP_ATT_HANDLE_VALUE_NOTIFY	0x1b
+struct bt_l2cap_att_handle_value_notify {
+	uint16_t handle;
+} __attribute__ ((packed));
+
+#define BT_L2CAP_ATT_HANDLE_VALUE_IND		0x1d
+struct bt_l2cap_att_handle_value_ind {
+	uint16_t handle;
+} __attribute__ ((packed));
+
+#define BT_L2CAP_ATT_HANDLE_VALUE_CONF		0x1e
+
 struct bt_l2cap_hdr_smp {
 	uint8_t  code;
 } __attribute__ ((packed));
diff --git a/monitor/l2cap.c b/monitor/l2cap.c
index 7602673..2f2b7ae 100644
--- a/monitor/l2cap.c
+++ b/monitor/l2cap.c
@@ -1655,6 +1655,18 @@ static void att_read_type_rsp(const struct l2cap_frame *frame)
 					frame->data + 1, frame->size - 1);
 }
 
+static void att_read_req(const struct l2cap_frame *frame)
+{
+	const struct bt_l2cap_att_read_req *pdu = frame->data;
+
+	print_field("Handle: 0x%4.4x", btohs(pdu->handle));
+}
+
+static void att_read_rsp(const struct l2cap_frame *frame)
+{
+	print_hex_field("Value", frame->data, frame->size);
+}
+
 static void att_read_group_type_req(const struct l2cap_frame *frame)
 {
 	print_handle_range("Handle range", frame->data);
@@ -1670,6 +1682,26 @@ static void att_read_group_type_rsp(const struct l2cap_frame *frame)
 					frame->data + 1, frame->size - 1);
 }
 
+static void att_handle_value_notify(const struct l2cap_frame *frame)
+{
+	const struct bt_l2cap_att_handle_value_notify *pdu = frame->data;
+
+	print_field("Handle: 0x%4.4x", btohs(pdu->handle));
+	print_hex_field("  Data", frame->data + 2, frame->size - 2);
+}
+
+static void att_handle_value_ind(const struct l2cap_frame *frame)
+{
+	const struct bt_l2cap_att_handle_value_ind *pdu = frame->data;
+
+	print_field("Handle: 0x%4.4x", btohs(pdu->handle));
+	print_hex_field("  Data", frame->data + 2, frame->size - 2);
+}
+
+static void att_handle_value_conf(const struct l2cap_frame *frame)
+{
+}
+
 struct att_opcode_data {
 	uint8_t opcode;
 	const char *str;
@@ -1693,8 +1725,10 @@ static const struct att_opcode_data att_opcode_table[] = {
 			att_read_type_req, 6, false },
 	{ 0x09, "Read By Type Response",
 			att_read_type_rsp, 4, false },
-	{ 0x0a, "Read Request"			},
-	{ 0x0b, "Read Response"			},
+	{ 0x0a, "Read Request",
+			att_read_req, 2, true },
+	{ 0x0b, "Read Response",
+			att_read_rsp, 0, false },
 	{ 0x0c, "Read Blob Request"		},
 	{ 0x0d, "Read Blob Response"		},
 	{ 0x0e, "Read Multiple Request"		},
@@ -1709,9 +1743,12 @@ static const struct att_opcode_data att_opcode_table[] = {
 	{ 0x17, "Prepare Write Response"	},
 	{ 0x18, "Execute Write Request"		},
 	{ 0x19, "Execute Write Response"	},
-	{ 0x1b, "Handle Value Notification"	},
-	{ 0x1d, "Handle Value Indication"	},
-	{ 0x1e, "Handle Value Confirmation"	},
+	{ 0x1b, "Handle Value Notification",
+			att_handle_value_notify, 2, false },
+	{ 0x1d, "Handle Value Indication",
+			att_handle_value_ind, 2, false },
+	{ 0x1e, "Handle Value Confirmation",
+			att_handle_value_conf, 0, true },
 	{ 0x52, "Write Command"			},
 	{ 0xd2, "Signed Write Command"		},
 	{ }